Lamp.



J. G. MQGREGOR.

LAMP.

APPLIOATION FILED MAY 23, 1912.

Patented Dec. 2, 1913.

rrnn srarrns PATENT onrron.

JOSEPH G. MOGREGOR, 0F OAK PARK, ILLINOIS, ASSIGNOR TO THE ADAMS &WESTLAKE GOIVIIANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LAMP.

To all whom it may concern:

Be it known that I, J osnrrr Gr. l\![cG-1ucoon, a citizen of the UnitedStates, and resident of Oak Park, county of Cook, and State of Illinois,have invented certain new and useful Improvements in Lamps, of which thefollowing is a specification, and which are illustrated in theaccompanying drawings, forming a part thereof.

The invention relates to lamps especially adapted for switch and signalservice in railroad work, and. its object is to provide iiinproved meansfor securely holding the font within the body of the lamp, consistingessentially of a font seat within the body, provided with parallelwalls, and a font having side walls of complementary form, the walls ofthe font and seat having horizontal interfitting channels and ribs.

The invention is illustrated in the accompanying drawings, in which-Figure- 1 is a detail vertical section of the lamp, transversely of thefont; Fig. 2 is a detail in perspective of the font; F 3 is a detail inperspective of the lamp body with its side or font-receiving door open.

The body, 10, of the lamp, is ordinarily cylindrical in form, and isprovided with a substantially flat bottom, 11, upon which the font, 12,rests, and with walls, 13, 14, rising from the bottom and forming partsof the font seat, the up er sections of these valls being inclinedlaterally and upwardly, as shown at 15, 16, and joining the side wallsof the body.

The walls 13, 14 are horizontally channeled, as shown at 17, 18, and theside walls of the font are provided with ribs, 19, 20, adapted to fitwithin these channels and thus prevent the font from being thrown out ofthe seat by jarring incident to service.

A spring catch, 21, secured back of one of Specification of LettersPatent.

Application filed May 23, 1912.

Patented Dec. 2, 1913.

Serial No. 699,122.

the walls, as 13, projects inwardly at the forward end of the wall, andis adapted to engage the outer end of the font when occupying the seat,and thus prevent its longitudinal movement.

The body 10 is provided with a door, 22, shown as adapted to slideupwardly, for the purpose of permitting the insertion of the font intothe body.

In lamps of this character, it has been customary to employ a springcatch, such as shown and described, for preventing the longitudinalmovement of the font, but no adequate provision has been made forpreventing the upward movement of the font, and as the result, jars andvibration incident to service have frequently thrown the font out ofposition, and thus moved the burner, 23, away from the axis of the lens,24. In modern railroad practice, the lenses employed in this type oflamp have been perfected with a view to projecting the shaft of light ina definite direction, and for this reason it is of vital importance thatthe ilhuninating agent be located directly upon the axis of the lens.

I claim as my invention- In a lamp, in combination, a body, parallelwalls rising vertically from the bottom of the body and being spacedapart from the side walls thereof and having their upper portionsextended laterally to the lamp body walls, a font having vertical sidesand being of such width that it slidingly engages the parallel walls,said parallel walls and the sides of the font engagcable therewithhavlng inter-engaging horizontal ribs and channels.

J OSEPII G. MCGREGOR.

\Vitnesses A. H. Hnmcnn, C. MANDEVILLE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

